I used Acronis TI (9 I think) to clone my HDD. I had a 150 GB disk that was my primary drive and a 40 Gb as secondary. Because my media library (MP3s, Photos, etc) has grown quite large, I wanted to make the 40 GB disk be the main system disk and make the bigger 150 GB disk be my media-files disk. So I used the Clone Disk feature in True Image. I stepped out of the room during the clone process and when I came back the screen was black with nothing but a flashing cursor. So I shut it down and opened the case. I took out the original primary disk and moved the secondary (now cloned to be the new primary) into the primary slot (yes, I switched the jumpers too). I booted it up and all is fine. Great. It worked very well. Thank you Acronis! Now, I want that other disk (the big one) to go back in as a secondary disk. so I switch the jumpers to the "slave" position, and plug it into the IDE cable. I boot it up but Windows doesn't see the disk at all. There is a letter assignment missing where the disk should be (G:\) but it's just not there. So, I figure I'll format the disk maybe. so I shut doen, removed my new primary disk, put the jumper back to "Master" on the big drive and try to boot from it. The computer shows the graphics card screen, shows the Motherboard screen (with "press Del for setup" prompt), then goes to a flashing cursor and does nothing more. I deleted into the BIOS settings and the disk seems to show up in the boot devices list (it has the make and model and everything so I know it sees the disk). No matter how many times I try I can't get this disk to show up as a master OR slave at all. I even put the disk in an enlosure and tried to plug it in as an external. Windows saw it as new hardware, installed it (again calling it by name even!) but it failed to show up as a disk under "My Computer". Any thoughts? My system: Asus P4 2.4 Ghz running Windows Xp home (Sp2) 1 Gb RAM And well.... only one HDD right now!